Quarterly report pursuant to Section 13 or 15(d)

VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - Statements of Operations of VIEs (Details)

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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - Statements of Operations of VIEs (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Oct. 31, 2019
Dec. 31, 2019
Dec. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Oct. 31, 2019
Dec. 31, 2020
Variable Interest Entity [Line Items]              
Revenues $ 105,827 $ 200,924 $ 309,897     $ 757,223 $ 884,730
Net loss (504,199) (152,543) (57,260) $ (162,919) $ (169,088) (836,206) (13,849)
VIE, primary beneficiary | Bristow Aviation Holdings Limited              
Variable Interest Entity [Line Items]              
Revenues 91,324 172,174 220,162     663,047 669,013
Operating income (loss) 47,917 (10,657) (116)     45,505 276,610
Net loss $ (112,587) $ (62,845) $ (84,302)     $ (193,867) $ 36,905